Die set



Patented July 20, 1948 UNITED STATES PATENT OFFICE DIESET Alfred W.Grunow, Nutley, N. J. Application April 5, 1945, Serial No. 586,7945Claims. (01.164-118) My invention relates to improvements in die setsand more particularly, has reference to means in combination therewithfor maintaining parallel relationship between the die shoe and punchholder thereof, providing adjustable post guide bearings for fitting andtaking up Wear, and means at the base of the die-shoe or holder forremoving dirt, grit and foreign matter from beneath the same. 4

Referring to the accompanying drawings, Fig. 1 illustrates in frontelevation, partly in section, a suitable arrangement of die setembodying an application of my invention. Fig. 2 is a plan view, partlybroken away, looking upwardly at Fig. 1, and Fig. 3 is an enlargeddetail partly in broken section showing an arrangement of taperedadjustable post guide bushing.

I indicates the die shoe or holder, in which is secured the pillars orposts 2 in the usual manner, and 3, 4 indicate the nuts and jam-nutsrespectively, threadably engaging the bushings 5, slotted from top andbottom as shown at 6, I, said bushings being also threaded as indicatedat 8. These bushings 5 are seated in tapered holes 9 in punch holderIII, and guide the movement of the latter on posts 2, annular grooves IIpicking up any grease or foreign matter thereon.

The punch holder I is also recessed in the top to receive the lowerpressure ring I2 which also is recessed in the top, providing a concavespherical surface I3, engaging a similar convex surface I4, forming theunder surface of the upper pressure ring l5, and the upper and lowerrings I and I2 respectively are secured in the press ram I6 and punchholder III respectively by screws II, I8 indicates the punch holdershank with flangedbase or throat I9, secured in the ram I6 as shown,leaving clearances between the punch holder I0, and rings I2 and I5 asindicated at 20, 2|, 22, and 23 respectively.

In operation, the holder or shoe I is secured upon the press (notshown), in the usual manner through openings 24, and the punch holderIII with bushings 9 is pushed down on posts 2, over which nuts 3 and 4have already been dropped. Nuts 3 then engage and are tightened on thelower threaded ends 8 of the bushings, after which the jam or look nuts4 are tightened against nuts 3. Ring I2 is secured by screws H to thepunch holder I0, and ring I5 is similarly secured by similar screws tothe press ram I6. The dies are secured to the die holders I and II] inthe usual manner. The cross-grooving 25 on the base of the lower dieholder or shoe I collect any grease or foreign matter beneath the samewhen pushed into place on the bed of the press.

In traveling downward, the punch holder and the upper part of the diesecured thereto, together with the ring I2, float into parallel relationto the shoe I and the lower part of the die secured thereon, thusinsuring a uniform pressure throughout the area and between the meetingsurfaces of the die, and between the parts attached thereto. Thisminimizes any likelihood of a broken die due to unevenness of pressureresulting from any angular relationship between pressed surfaces whetherfrom incorrect, mounting, or from foreign matter under the shoe or uponthe guide posts 2.

Of course it will be understood that various modifications may be madein the construction and arrangement of parts without departing from thespirit of the invention as claimed,

I claim:

1. In a two part die set, means to reciprocate one part with relation tothe other, a ring bearing surrounding an extension on said means, saidring being attached to said means, a second ring bearing looselysurrounding said extension and attached to one part, said second ringattaching said means to said first part, spherical cooperating bearingsurfaces on said rings bearings, said spherical surfaces allowingmovement such that the first part may automatically maintain parallelismbetween the two die parts.

2. A die set of the character disclosed having fixed and movable parts,means for driving said movable part, concave and convex concentricbearing rings between said movable part and driving means, one of saidrings loosely engaging said movable part and said driving means, toallow automatic paralleling of said parts when in use.

3. A die set of the character disclosed having fixed and movable parts,means for driving said movable part, concave and convex concentricbearing rings between said movable part and driving means, one of saidrings loosely engaging said movable part and said driving means, toallow automatic paralleling of said parts when in use, said drivingmeans extending through one of said rings.

4. A die set of the character disclosed having fixed and movable parts,means for driving said movable part, concave and convex concentricbearing rings between said movable part and driving means, one of saidrings loosely engaging said movable part and said driving means, toallow automatic paralleling of said parts when in use, one of saidbearings secured to part of said driving means and the other to saidmovable part.

5. A die set of the character disclosed having fixed and movable parts,means for driving said movable part, concave and convex concentricbearing rings between said movable part and driving means, one of saidrings loosely engaging said movable part and said driving means, to

allow automatic'paralleling of said parts when l in use, one of saidbearings rigidly secured to part of said driving means and loosely tosaid movable means.

ALFRED W. GRU'NOW.

REFERENCES orrEfi The following references are of record in th file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,091,707 Reed Mar. 31, 19141,568,017 Danly Dec. 29, 1925 2,013,488 Carrier Sept. 3, 1935 2,151,831Buccicone Mar. 28, 1939 Re. 22,422 Whistler Jan. 18, 1944

